Heating the water makes the water molecules move more. A lot more. So they also break down water-soluble things faster.
Its the same thing with salt or sugar. If you put either in cold water it will dissolve less and slower than if you heat the water.
Steeping tea is dissolving and breaking down various things in the tea leaves. It will steep in cold water…. eventually. And unless the tea is intended for cold steeping its probably not going to be as strong either.
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